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AD9671EBZ датащи(PDF) 18 Page - Analog Devices |
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AD9671EBZ датащи(HTML) 18 Page - Analog Devices |
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18 / 61 page ![]() Data Sheet AD9671 Rev. A| Page 17 of 60 1.4 1.2 1.0 0.8 0.6 0.4 110 FREQUENCY (MHz) 23456789 Figure 15. Short-Circuit, Input Referred Noise vs. Frequency –132 –146 –5 45 CHANNEL GAIN (dB) –144 –142 –140 –138 –136 –134 0 5 10 15 20 25 30 35 40 PGA GAIN = 21dB Figure 16. Short-Circuit, Output Referred Noise vs. Channel Gain, LNA Gain = 21.6 dB, PGA Gain = 21 dB, VGAIN = 1.6 V 70 50 10 55 CHANNEL GAIN (dB) 52 54 56 58 60 62 64 66 68 15 20 25 30 35 40 45 50 PGAGAIN = 21dB PGAGAIN = 27dB PGAGAIN = 30dB PGAGAIN = 24dB Figure 17. SNR vs. Channel Gain and PGA Gain, AOUT = −1.0 dBFS 70 50 10 55 CHANNEL GAIN (dB) 52 54 56 58 60 62 64 66 68 15 20 25 30 35 40 45 50 LNAGAIN = 17.9dB LNAGAIN = 21.6dB LNAGAIN = 15.6dB Figure 18. SNR vs. Channel Gain and LNA Gain, AOUT = −1.0 dBFS 74 54 –5 55 CHANNEL GAIN (dB) 56 58 60 62 64 66 68 70 72 15 10 5 0 20 25 30 35404550 PGAGAIN =21dB PGAGAIN = 30dB PGAGAIN =27dB PGAGAIN =24dB Figure 19. SNR vs. Channel Gain and PGA Gain, AIN = −45 dBm 0 –10 020 15 10 5 INPUT FREQUENCY (MHz) –9 –8 –7 –6 –5 –4 –3 –2 –1 SPEED MODE = I (40MSPS) LOW BANDWIDTH MODE Figure 20. Antialiasing Filter (AAF) Pass-Band Response, LPF Cutoff = 1 × (1/3) × fSAMPLE, HPF = 1/12 × LPF Cutoff |
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